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I'm having this same problem. I had my phone for about a year and then suddenly it started doing this. Called Sprint and they sent me a new phone. Everything was fine for about a month and now it's doing it again. I've tried everything, hard reset, loading no software, etc. It must be service related but I don't understand how.

Update: I called Sprint and they had me hard reset the phone. This got everything working again but I'm really tired of having to reload all my data / programs all the time. I've been using WinMo for about 5 years now but I'm thinking of switching to Android. I'm so burned out on the problems with Windows Mobile.